CN1223882C

CN1223882C - Liquid-crystal display and production thereof

Info

Publication number: CN1223882C
Application number: CNB021294763A
Authority: CN
Inventors: 朴武烈; 丁圣守; 卞溶相
Original assignee: LG Philips LCD Co Ltd
Current assignee: LG Display Co Ltd
Priority date: 2002-02-20
Filing date: 2002-08-22
Publication date: 2005-10-19
Anticipated expiration: 2022-08-22
Also published as: JP2008123003A; US7218374B2; JP2003241204A; KR100672641B1; KR20030069328A; CN1439914A; US20030156246A1; USRE46146E1

Abstract

An LCD device and a method of manufacturing the same are disclosed, in which a sealant concentrated upon the end of a dispensing device is formed in a dummy region on a substrate, so that a liquid crystal layer is not contaminated when both substrates are attached to each other and a cell cutting process can easily be performed. The method of manufacturing an LCD device includes preparing a lower substrate and an upper substrate, forming an auxiliary UV sealant in a dummy region on one of the lower and upper substrate and forming a main UV sealant, applying a liquid crystal on one of the lower and upper substrates, attaching the lower and upper substrates, and irradiating UV light onto the attached substrates.

Description

The method for making of liquid crystal indicator

The application requires the rights and interests of the P2002-8900 korean patent application of on February 20th, 2002 application, all purposes that relate to respect to the application, in this application with above-mentioned application with the in addition combination of the form quoted.

Technical field

The present invention relates to a kind of LCD (LCD) device, or rather, relate to a kind of by the sealant structure of the LCD device that liquid crystal makes is set on substrate surface.

Background technology

Usually, the thickness of displays of ultrathin flat-panel monitor is several centimetres or thinner.Particularly, plate LCD device is low and carry the monitor that is widely used as notebook computer, spacecraft and aircraft easily owing to its energy consumption.

This LCD device comprises infrabasal plate, upper substrate, and liquid crystal layer.On infrabasal plate, form thin film transistor (TFT) (TFT) and pixel electrode.Upper substrate and infrabasal plate are oppositely arranged.On upper substrate, form light shield layer, color filter layer and common electrode.Between infrabasal plate and upper substrate, liquid crystal layer is set.During work, between infrabasal plate and upper substrate, form electric field by pixel electrode and common electrode, and by the molecular orientation in electric field " driving " liquid crystal layer.Control the optical transmission rate by driving liquid crystal layer, thus display image.

In above-mentioned LCD device,, adopt vacuum impregnation usually based on capillarity and pressure differential in order between infrabasal plate and upper substrate, to form liquid crystal layer.Yet the problem of this vacuum impregnation is, when liquid crystal is injected big display board, need take a long time, and has therefore reduced throughput rate.

In order to address this problem, a kind of liquid crystal is placed a method on the substrate and developed.Describe with reference to Figure 1A-1D below.Although only show a unit box in the accompanying drawing, can make a plurality of unit boxes according to the size of substrate.

Shown in Figure 1A, prepare infrabasal plate 1 and upper substrate 3.On infrabasal plate 1, form many gate lines and data line (not shown).Gate line and data line intersect to form pixel region.On each point of crossing of gate line and data line, form the thin film transistor (TFT) (not shown).In pixel region, form the pixel electrode (not shown) that links to each other with thin film transistor (TFT).

Forming the light shield layer (not shown) on upper substrate 3 leaks from gate line, data line and thin film transistor (TFT) to prevent light.On light shield layer, form red (R), green (G) and blue (B) color filter layer, and on color filter layer, form common electrode.Form the oriented film (not shown) at least one substrate in infrabasal plate 1 and upper substrate 3 so that the initial orientation of liquid crystal molecule.

Shown in Figure 1B, sealant 7 is set on infrabasal plate 1, and liquid crystal 5 is applied on it, form liquid crystal layer thus.Scattering on the upper substrate 3 or spraying the wadding (not shown) to keep the box gap between upper substrate and the infrabasal plate.

In the method that applies with liquid crystal serves as that the basis makes in the method for LCD device, before sealant 7 solidifies, forms liquid crystal layer on the substrate that adheres to mutually.So, if with the heat curing-type sealant as sealant 7, then liquid crystal when being heated with heating, expansion and flow out substrate.Therefore, liquid crystal 5 contaminated problems will appear.So, serve as that the basis makes in the method for LCD device in the method that applies with liquid crystal, use in ultraviolet (UV) but under the light action at least the sealant of local solidification as sealant 7.

Arrange the UV sealant by silk screen print method or apportion design.In silk screen print method, because silk screen and substrate contacts, so may damage the oriented film that on substrate, forms.And, if the dimensioned area of substrate is very big, then can increase the loss of sealant.Consider these aspects, preferably use apportion design.

Shown in Fig. 1 C, infrabasal plate 1 is attached on the upper substrate 3.

Shown in Fig. 1 D, sealant 7 is solidified by UV radiation appliance 9 emission UV light.

After this, though not shown, need carry out box cutting action and final inspection process, and then make liquid crystal cell.

At this, Fig. 2 A and 2B are the process of UV sealant is arranged in expression with apportion design skeleton views.According to before being attached to each other at substrate liquid crystal being applied to method on one of them substrate, owing to do not need the liquid crystal filling orifice, so available allocation device 8 forms the sealant 7 that does not have filling orifice on infrabasal plate 1.

Yet, because sealant 7 has high viscosity, so before distributing sealant 7, sealant 7 can accumulate in the nozzle-end of distributor 8.Therefore, at the drop " A " that begins sealant 7 is deposited to the some place meeting excess deposition sealant 7 on the substrate.

Shown in Fig. 2 C, when being attached to infrabasal plate 1 on the upper substrate 3, the sealant of excessive distribution is distributed to active area (substrate middle part) and virtual area (substrate outside).In this case, the problem that sealant is distributed to active area and pollutes liquid crystal can occur, simultaneously, particularly after sealant cures, the sealant that is distributed to virtual area can cause difficulty to the box cutting action.

Summary of the invention

Therefore, the object of the present invention is to provide a kind of method for making of LCD device, it has overcome one or more problems of bringing because of the restriction of prior art and shortcoming basically.

The invention has the advantages that, in the method for making of the LCD device that it provided, sealant arrangement is become at Shi Buhui that two substrates is attached to each other to pollute liquid crystal and can easily carry out the form of box cutting action.

Other features and advantages of the present invention will provide in the following description, and wherein a part of feature and advantage can obviously draw or obtain by practice of the present invention in check subsequently for the person of ordinary skill of the art.Structure by particularly pointing out in explanatory note part, claims and accompanying drawing can realize and obtain purpose of the present invention and other advantage.

In order to obtain these and other advantage and according to purpose of the present invention, as recapitulative and description broad sense, the method for making LCD device of the present invention comprises, prepares infrabasal plate and upper substrate; On one of them of infrabasal plate and upper substrate, arrange auxiliary sealant and then arrange the primary seal agent, wherein be arranged in auxiliary sealant in the virtual area and make it and the primary seal agent is joined; Liquid crystal is put on the substrate in infrabasal plate and the upper substrate; Infrabasal plate and upper substrate are attached to together, and the primary seal agent is solidified.

According to one embodiment of the present of invention, auxiliary UV sealant is not born the conventional func of sealant, that is, it does not prevent that liquid crystal from leaking.Main UV sealant then plays the sealant of restriction liquid crystal range.

According to another aspect of the present invention, the method for described making LCD (LCD) device comprises, prepares infrabasal plate and upper substrate; On one of them of infrabasal plate and upper substrate, arrange auxiliary sealant and primary seal agent, wherein be arranged in auxiliary sealant in the virtual area and make it prolong from the primary seal agent; Liquid crystal is put on the substrate in infrabasal plate and the upper substrate; Infrabasal plate and upper substrate are attached to together, and on the substrate that adheres to, shine UV light.

According to one aspect of the present invention, auxiliary UV sealant arrangement in the virtual area of substrate, is arranged enclosed type master UV sealant then, thereby in the virtual area of the sealant arrangement that will accumulate in the distributor nozzle-end to the substrate.

Obviously, top generality is described and following detailed description all is exemplary and indicative, and it is intended to claim of the present invention is further explained.

Brief Description Of Drawings

The accompanying drawing that the application comprised is used for further understanding the present invention, and it combines with instructions and constitutes the application's a part, and described accompanying drawing is represented embodiments of the invention and explained principle of the present invention with instructions.

In the accompanying drawing:

Figure 1A-1D represents to apply the method skeleton view that legal system is made the LCD device according to the liquid crystal of prior art;

Fig. 2 A and 2B are the process of UV sealant is arranged in expression with the apportion design of prior art skeleton views;

Fig. 2 C is illustrated in the skeleton view of sealant is arranged in the substrate back that is attached to each other with the apportion design of prior art;

Fig. 3 A-3D is the skeleton view of expression according to the method for the described making of first embodiment of the present invention LCD device;

Fig. 4 A-4D is a skeleton view of arranging the process of UV sealant in the process that is illustrated in according to the described making of second embodiment of the invention LCD device;

Fig. 5 A and 5B are the skeleton views of arranging the process of sealant in the method that is illustrated in according to the described making of third embodiment of the invention LCD;

Fig. 6 is the skeleton view of expression according to the described LCD device of fourth embodiment of the invention; With

Fig. 7 A and 7B are the sectional views of taking from the line I-I among Fig. 6.

Embodiment

To describe embodiment of the present invention in detail now, the example of described embodiment is shown in the drawings.In institute's drawings attached, will represent identical or same parts with identical reference marker as far as possible.

Fig. 3 A-3D is the skeleton view of expression according to the described making of first embodiment of the invention LCD method.

Although only show a unit box in the accompanying drawing, can make a plurality of unit boxes according to the size of substrate.

As shown in Figure 3A, prepare infrabasal plate 10 and upper substrate 30 for whole process.On infrabasal plate 10, form many gate lines and data line (not shown).Gate line and data line intersect to form pixel region.On each point of crossing of gate line and data line, form thin film transistor (TFT) (not shown) with grid, gate insulator, semiconductor layer, ohmic contact layer, source/drain electrode and protective seam.In pixel region, form the pixel electrode (not shown) that is connected with thin film transistor (TFT).

On pixel electrode, form the oriented film (not shown) of the brilliant molecule initial orientation of feed flow.Oriented film can be used through polyamide or polyimide based compound, polyvinyl alcohol (PVA) (PVA) and the polyamic acid of friction and make.In addition, also can use such as photochromicss such as tygon cinnamate (PVCN), polysiloxane cinnamate (PSCN) or cinnamate cellulose (CelCN) based compound making oriented film by the optical orientation method.

On upper substrate 30, form the light shield layer (not shown) to block the light that spills from gate line, data line and thin film transistor region.On light shield layer, form R, G and B color filter layer (not shown).On color filter layer, form the common electrode (not shown).In addition, can between color filter layer and common electrode, form the coating (not shown).On common electrode, form oriented film.

Form silver (Ag) point so that after infrabasal plate 10 and upper substrate 30 were attached to each other, the common electrode on upper substrate 30 applied voltage in the outside of infrabasal plate 10.In addition, also silver point can be arranged on the upper substrate 30.

The LCD of switch in the opposite (IPS) pattern, common electrode is the same with pixel electrode to be formed on the infrabasal plate, and between common electrode and pixel electrode induced electric field flatly.Silver point is not set on substrate.

Shown in Fig. 3 B, liquid crystal 50 is set on infrabasal plate 10 to form liquid crystal layer.

In the virtual area of an angular region of upper substrate 30, arrange auxiliary UV curable encapsulant 70a, then, arrange the main UV curable encapsulant 70b that does not have filling orifice with apportion design.

Auxiliary UV sealant 70a can prevent any problem that possibility causes because of the sealant that accumulates on the distributor nozzle-end.Therefore, which position that auxiliary UV sealant 70a is arranged in the substrate virtual area is unimportant, as long as all sealant drops that form all leave the active area of liquid crystal indicator and leave liquid crystal board from zone that the mother substrate assembly downcuts.Should arrange auxiliary UV sealant 70a earlier, arrange main UV sealant 70b then.Can will assist UV sealant 70a to be arranged to as shown in FIG. linearity.In addition, also can will assist UV sealant 70a to be arranged to curve or other shape, get final product so long as be arranged in the virtual area.

Can use two ends and the monomer of acrylic coupling that is mixed with initiating agent or oligomer as UV sealant 70a and 70b.In addition, can also use an end and acrylic coupling and the other end and the monomer of epoxy radicals coupling that is mixed with initiating agent or oligomer as

sealant

70a and 70b.

And if before main UV sealant 70b solidifies liquid crystal is contacted with main UV sealant 70b, liquid crystal 50 can be polluted.Therefore, preferably liquid crystal 50 is arranged in the middle part of infrabasal plate 10.In this case, liquid crystal 50 can disperse after main UV sealant 70b solidifies gradually equably.Liquid crystal 50 is distributed on the substrate equably.

Liquid crystal 50 can be arranged on the upper substrate 30 and

UV sealant

70a and 70b are arranged on the infrabasal plate 10.But also liquid crystal 50 and

UV sealant

70a, 70b can be arranged on the substrate.In this case, in manufacturing process, at the substrate that has liquid crystal and sealant with will not occur uneven between the processing number of times with the substrate of liquid crystal and sealant.For this reason, can increase the T.T. of fabrication and processing.And, when on a substrate, forming liquid crystal and sealant, before two substrates are attached to each other, even be subjected to polluting can not cleaning base plate for sealant.

Therefore, after being set to

UV sealant

70a, 70b on the upper substrate 30, before adhering to operation, need set up the matting of cleaning upper substrate 30.

Simultaneously, arrange on any in two

substrates

10 and 30 that wadding is to keep the box gap.Preferably, on upper substrate 30, wadding is set.

Can use as wadding with sphere or color filter combinde with columns.The globe lining bedding and padding can be set in such a way, that is, they be mixed with the solution of suitable concn, be distributed on the substrate from the nozzle high pressure then.Color filter combinde with columns is set on that part of substrate corresponding with gate line or data line.For large-size substrate, because the globe lining bedding and padding may make the box gap inhomogeneous, so, preferably use color filter combinde with columns for large-size substrate.Can make color filter combinde with columns with photosensitive organic resin.

Shown in Fig. 3 C, infrabasal plate 10 and upper substrate 30 are attached to together by following step.At first, a substrate that has dripped liquid crystal is put into downside.Be put into upside with behind another piece substrate Rotate 180 °, and make the substrate of its part in the face of downside with multilayer.Then, on the upside substrate, exert pressure, two substrates are attached to each other.In addition, the space between the substrate can be remained on vacuum state, thereby can two substrates are attached to each other together by removing vacuum state.

Then, shown in Fig. 3 D, on the substrate that adheres to mutually, shine UV light by UV radiation appliance 90.

In the process of irradiation UV light, be configured monomer or the oligomer generation polymerization and the curing of the initiating agent activation of UV sealant, thereby infrabasal plate 10 is bonded on the upper substrate 30.

If the monomer of the other end and the epoxy radicals coupling that is mixed with initiating agent or oligomer then can not make the complete polymerization of epoxy radicals by applying UV light as the UV sealant with an end and acrylic coupling.So after the UV irradiation, sealant must be heated one hour down in addition at about 120 ℃, thereby make the sealant full solidification.

After this, although do not illustrate, bonding substrate cut is become unit box and carries out last inspection process.

In cutting action, on the surface of substrate, form line of cut and finish crossed process with pen or cutting wheel, the material hardness of pen or cutting wheel for example can be an adamas greater than the hardness of glass, passes through mechanical impact (breaking step of breaking) then along the line of cut cutting substrate.In addition, can finish line and breaking step of breaking simultaneously with the pen or the cutting wheel of adamas or his hard material of base.

The line of cut of cutting action be arranged on can be sealant drop A the auxiliary sealant starting point and and the main UV sealant that intersects of the auxiliary UV sealant 70a of initial formation between.At last, remove the entity part of the auxiliary UV sealant 70a of excessive distribution.

Fig. 4 A-4D is in the method that is illustrated in according to the described making of second embodiment of the invention LCD device, the skeleton view of the operation of irradiation UV light.Second embodiment is except the UV irradiation process, and other parts are all identical with first embodiment.In a second embodiment, before irradiation UV light, cover the zone that sealant is not set with mask.Because the miscellaneous part of second embodiment is identical with first embodiment, so will represent identical parts and omission detailed description with identical reference marker to these parts.

If UV illumination is mapped on the whole surface of the substrate that is attached to each other, UV light may make the characteristic such as devices such as thin film transistor (TFT)s on the substrate degenerate and may change into the tilt angle of the oriented film that makes the liquid crystal initial orientation and be provided with.

Therefore, in the second embodiment of the present invention, need to cover irradiation UV light when sealant regional is not set with mask.

With reference to Fig. 4 A, cover the zone that auxiliary UV sealant 70a and main UV sealant 70b are not set with mask 80.Mask 80 is placed the substrate upside that adheres to mutually, and irradiation UV light.

And, also mask 80 can be located at the substrate downside that adheres to.In addition, although as shown in FIG., irradiation UV light on the upper surface of base plate 30 that adheres to,, also the substrate that can adhere to by rotation and on infrabasal plate 10 irradiation UV light.

If be reflected and shine on the opposite side, may make as mentioned above then that the characteristic such as devices such as thin film transistor (TFT) and oriented film degenerates on the substrate from the UV light of UV radiation appliance 90.Therefore, preferably mask is arranged on the downside and the upside of the substrate that adheres to.

That is to say, shown in Fig. 4 B, the mask 80 and 82 that covers the zone that

sealant

70a and 70b are not set is arranged on the upside and the downside of the substrate that adheres to mutually.On substrate, shine UV light then.

Simultaneously, because auxiliary UV sealant 70a does not play sealant, so do not need to solidify.And, because in the box cutting action of back, zone and the box line of cut of auxiliary UV sealant 70a are overlapping, so, for the box cutting action, wish that more auxiliary UV sealant 70 does not solidify.

With reference to Fig. 4 C and 4D,, when promptly covering auxiliary sealant 70a simultaneously, auxiliary UV sealant 70a is solidified by irradiation UV light with mask when only cover the zone that main UV sealant 70b is not set with mask.

In this case, in Fig. 4 C, be in irradiation UV light under the situation of the substrate downside that adheres to or upside at mask 80.In Fig. 4 D, irradiation UV light when mask 80 is in the substrate downside that adheres to and upside respectively.

Fig. 5 A and 5B are in the method that is illustrated in according to the described making of third embodiment of the invention LCD device, and the skeleton view of the operation of UV sealant is set.

The 3rd embodiment is except the UV irradiation process, and other parts are all identical with second embodiment.In the 3rd embodiment, with certain pitch angle irradiation UV light.Because other parts of the 3rd embodiment are identical with second embodiment, so will represent identical parts and omission detailed description with identical reference marker to them.

If light shield layer is set on the zone that is provided with the UV sealant and such as gate line and the such metal wire of data line, then the UV line will shine less than this zone, therefore can not make sealant cures.Like this, can reduce adhesion between infrabasal plate and the upper substrate.

Therefore, in the third embodiment of the present invention, UV light is radiated on the substrate that is provided with the UV sealant with certain inclination angle, so even form light shield layer or metal line layer between UV light irradiation surface and sealant, the UV sealant can solidify too.

For with certain inclination angle irradiation UV light, as shown in Fig. 5 A, be horizontally disposed with the substrate that adheres to and UV radiation appliance 90 is arranged to have certain inclination angle [theta].In addition, shown in Fig. 5 B, also the substrate that adheres to can be arranged to have certain inclination angle and UV radiation appliance 90 is arranged to horizontality.

And, when covering with mask shown in Fig. 4 A-4D when sealant regional is not set, can be with certain inclination angle irradiation UV light.

Fig. 6 is the skeleton view of expression according to the described LCD device of fourth embodiment of the invention, and Fig. 7 A and 7B are the sectional views of taking from Fig. 6 center line I-I and II-II.

As shown in Figure 6 and Figure 7, comprise infrabasal plate 10 and upper substrate 30 according to LCD device of the present invention, be located at the UV sealant between infrabasal plate 10 and the upper substrate 30, described sealant comprise the auxiliary UV sealant 70a that is located in the virtual area and with the peripheral main UV sealant 70b that auxiliary UV sealant 70a joins, between infrabasal plate 10 and upper substrate 30, be provided with liquid crystal layer 50.

Simultaneously, although not shown, thin film transistor (TFT), pixel electrode and oriented film are set on infrabasal plate 10.Black matrix layer (not shown), color filter layer (not shown), common electrode (not shown) and oriented film (not shown) are set on upper substrate 30.And, wadding is being set to keep the box gap between the substrate between infrabasal plate 10 and the upper substrate 30.

As mentioned above, have the following advantages according to LCD device of the present invention and preparation method thereof.

Owing to be in the virtual area of substrate, to arrange the sealant accumulate in the distributor nozzle-end, so can and not finish the box cutting action easily because of the operation contaminating fluid crystal layer of attaching substrates.

In addition, when when the substrate downside that adheres to and/or upside are provided with mask, if on substrate irradiation UV light, then UV light only shines the zone that is provided with the UV sealant.In this case, can not damage the oriented film that is formed on the substrate, the characteristic such as devices such as thin film transistor (TFT)s is degenerated.

At last, if,, also can make sealant cures, therefore can avoid the adhesion between infrabasal plate and the upper substrate to descend even on sealant, form light shield layer or metal wire with certain inclination angle irradiation UV light.

To those skilled in the art, obviously, can make various modifications and variations to the present invention.Therefore, the invention is intended to cover those and fall into claims and interior improvement and the modification of equivalent scope thereof.

Claims

1, the method for making LCD (LCD) device comprises:

Prepare infrabasal plate and upper substrate;

On one of them of infrabasal plate and upper substrate, arrange auxiliary sealant and then arrange the primary seal agent, wherein be arranged in auxiliary sealant in the virtual area and make it and the primary seal agent is joined;

Liquid crystal is put on the substrate in infrabasal plate and the upper substrate by predetermined pattern;

Infrabasal plate and upper substrate are attached to together, and

The primary seal agent is solidified.

2, method according to claim 1 wherein, makes primary seal agent and auxiliary sealant partly solidified at least and solidify the primary seal agent and comprise irradiation UV light by irradiation UV light.

3, method according to claim 1, wherein auxiliary sealant and primary seal agent are adjacent to each other.

4, method according to claim 2, wherein the oligomer with two ends and acrylic coupling constitutes sealant.

5, method according to claim 2, wherein the monomer with two ends and acrylic coupling constitutes sealant.

6, method according to claim 2, wherein the oligomer of the other end and epoxy radicals coupling constitutes sealant with an end and acrylic coupling.

7, method according to claim 2, wherein the monomer of the other end and epoxy radicals coupling constitutes sealant with an end and acrylic coupling.

8, method according to claim 2 further is included in the heated sealant agent afterwards of irradiation UV light.

9, method according to claim 6 further is included in the heated sealant agent afterwards of irradiation UV light.

10, method according to claim 7 further is included in the heated sealant agent afterwards of irradiation UV light.

11, method according to claim 2 wherein during using the UV rayed, covers the zone that sealant is not set with mask.

12, method according to claim 2 wherein during using the UV rayed, covers the zone that main UV sealant is not set with mask.

13, method according to claim 2 is wherein shone UV light with respect to the substrate that adheres to certain pitch angle.

14, method according to claim 1 further is included in color filter combinde with columns is set on the upper substrate.

15, method according to claim 1 is wherein forming primary seal agent and auxiliary sealant and applying liquid crystal on infrabasal plate on the upper substrate.

16, method according to claim 1 further comprises the substrate that cutting is adhered to.

17, method according to claim 16 is wherein passed auxiliary sealant and is partly cut the substrate that adheres to.

18, method according to claim 2 further comprises:

Before irradiation UV light, on the zone that the primary seal agent is not set, mask is set, thereby auxiliary sealant is not exposed under the UV light; With

The substrate that cutting is adhered to.

19, the method for a kind of making LCD (LCD) device comprises:

Prepare infrabasal plate and upper substrate;

On one of them of infrabasal plate and upper substrate, arrange auxiliary UV sealant and main UV sealant, wherein will assist the UV sealant arrangement in virtual area and make it prolong from main UV sealant;

Liquid crystal is put on the substrate in infrabasal plate and the upper substrate;

With infrabasal plate and upper substrate is attached to together and

Irradiation UV light on the substrate that adheres to.

20, method according to claim 19 wherein makes UV light and shines with certain inclination angle with respect to the substrate that adheres to.